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<p>An object whose identifier is declared with the storage-class specifier <span class="t-c"><span class="mw-geshi c source-c">_Thread_local</span></span> <span class="t-mark-rev t-since-c11">(since C11)</span> has thread storage duration. Its lifetime is the entire execution of the thread for which it is created, and its stored value is initialized when the thread is started. There is a distinct object per thread, and use of the declared name in an expression refers to the object associated with the thread evaluating the expression. The result of attempting to indirectly access an object with thread storage duration from a thread other than the one with which the object is associated is implementation-defined.
</p>
<h3><span class="editsection">[<a href="http://en.cppreference.com/mwiki/index.php?title=c/language/thread_storage_duration&action=edit&section=1" title="Edit section: Example">edit</a>]</span> <span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="kw4">const</span> <span class="kw4">double</span> PI <span class="sy1">=</span> <span class="nu16">3.14159</span><span class="sy4">;</span> <span class="coMULTI">/* const variable is global to all threads */</span>
_Thread_local <span class="kw4">unsigned</span> <span class="kw4">int</span> seed<span class="sy4">;</span> <span class="coMULTI">/* seed is a thread-specific variable */</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">(none)</pre></div></div>
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